When we were discussing a soon to be initiated helicopter transport system in the hospital I worked in (Bangor Maine), the ED folks pushed this concept.

One advantage to helicopter transport is that it extends the emergency department to the incident site. Not only does it get you to the Emergency Department quicker, but it gets the ED to the site quicker. The crews and equipment aboard are usually more sophisticated and provide a higher level of trauma care than ground vehicles.

This might be just a factor of the rural nature of Maine where most ambulance responders are volunteers and the air crews are full time trauma teams.

I other places it might not make such a difference.

Nomad